principal optic axis

• 主光轴

principal optic axis的用法和样例：

例句

1. Light that passes focus is refracted to be parallel to the main optical axis.
   通过焦点的光线折射后平行于主光轴。
2. Luminaire designed to be suspended from a cable with its main beam axis at right angles to the axis of the road.
   利用电缆进行悬挂的灯具，其主光轴与道路主轴成直角。